Automatic bag sewing machine



June 17, 1947. F. LOMBARDO 2,422,426

AUTOMATIC BAG SEWING MACHINE Filed Aug. ll, 1944 3 Sheets-Sheet 1INVENTOR.

Y AJTTO/WVEV.

@vvk Lombarda June E7, 1947. F. LOMBARDO AUTOMATIC BAG SEWING MACHINEFiled Aug. 11, 1944 5 sneetssneet 2 INVENTOR jun@ y?, g'r?. F, LOMBARDOAUTOMATIC BAG SEWING MACHINE Filed Aug. ll, 1944 5- Sheems--Sheerl 5INVENToR. fa/7k O/Wam/o 1477 @NEX Patented June 17, 1947` UNITED STATESPATENT F FICE .AUTOMATIC BAG SEWING'MAGHINE i Frank Lombardo, Kansas"City, Mo.

LApplication.August.11, 1944, :Serial N0. .548,976

8 Claims.

This invention relates `to'equipment employed in the .manufacture ofbags, in the nature of thoserequiredzto bie stitched along at least twomarginal edges, .and ythe ,primary aim .is to ,providesewingapparatushaving unique and novel conveying Yelements in association with .ayilluralityof sewing-machines, whereby the bags maybe-'transportedLoneat .atime into operative relation VVwith eachmachine.

This invention has for an important object, `the provision ni bag makingiequipment wherein is included, :in icomibination with :at #least two'sewing machines, :.a .conveyor :orfmoving the bags past `the severalmachines to rsuccessifvely stitch the :marginal edges .of the :bagblank, .said conveyor .being aconstructed y'to .shift lthe bags .afterAleaving :one :machine and before :introducing `the same -to the nextsucceeding .sewing machine.

'Anpther object :of this invention .is `.the A.pro-

visionof a bagmakng machine .havingparts for 'automatically presenting:each -of several .marginal Tedges* to lseparate sewing machines, :as'the bag is moved along a rectilinear pathfoftravel vThis invention hasiffor .further ,aims -the .provision in .a -bag :making machine, `of@parts -ior severing .the threadsiaftereach `marginal edge-.0f the bag:haswbeenf-stitched; means for automat- :ically moving the thread.severing *,.parts to and from -fthe .operative position; :elements forsup- .portingathe bags for fmovementfthrough ithe y ma- -chine `:and iorautomatically rejecting the .bags .after .-the .same @have :beenstitched .along at 4least .two V:edges thereof; zand aunque manuallyPoper- .able clamps ...for holding the .bags .against rotatable .tables.withmarginal :edges :disposed .to .be engaged Lby .thesewing .machines.forming a .part ,ofthe equipment.

Other objects f'the invention will appeanduring thecourse ,of .thefollowing.specication,re ferring tothe accompanying drawings, wherein:

'Fig'. 1.-is. a.'t0.p.p1an viewof an -automaticlbag sewing machinemadein laccordance with 'the present invention.

Fig. 2 is aside elevational view thereof.

..Fig. A3 -'is Ha .vertical transverse, enlarged sectional ^view througha 'portion cf "the machine taken on line III-III of Fig. 2.

Fig.4"isafragmentarydetailed sectional view `rcitatable' tableassemblies, entirely removedxfrom r2 the :operative relation with .theremaining lportion yof the machine. Y

The preferred `embodiment loi the invention which has been-chosen `forillustration, is capable of sewing Vtwo marginal edges -of a bag as thesame is A.passed through the equipment and a single'operator is .allthat isrequired to manipulate-.the apparatus;` it beingbut necessaryxtoplace the bags-upon Acontinuously moving tables as they pass the feedingstation. When the folded blanks of .the bags are introduced tothemachine, -they are stitched along two marginal edges, the .threads .are.automatically severed after each stitching, .andthe completed bag isejected yfrom the machine `as the .tables `are cleared for .the furtherintroduction of additional, unstitched vbag blanks.

The machine comprisesa suitable frame-work `l0 -upon which is mountedall of the operating ,-parts, .and particularly the endless chains I2,disposed.inspaced-apart relation and carried by sprockets VHladjacentvto `each end of frame IU. Sprockets I4 are securedto shafts i6journalled Ain `slidable vbearings l-8 Athat are in turn held in desiredadjusted conditonby set screws 20.

.A seriesof plates 22 ,attached to chains .I'Zby integral ears 24maintain tables 26 in place. Each plate 2.2 carriesa turn-table 2.6through themediumotstubshaftfzroller bearing 30, and stop ,collar..3'2..When a table .25 is so mounted upon .plat.e..22, .it .is `free torotate about the :axis of vstub .shaft 28, .limited onlyA by pin 34which extends through anarcuate slot 36 provided in plate 22.

A spring ,-yieldably .maintains table 2-6in .the .position .withzits.longitudinal axis in alignment withthepathof .travel of. chains. l 2and theseries .oftables 26. .This spring 38 has one end anchored.asat-.Ml totheundersideof plate 22 and its op- ,.positeend fastened as`at-ll-Z ,to stop .collar 32, .pinned .to .stub shaft .28.

rEars 24 are pivotally .attached to chain l2 by'gpassingfa bolt oranalogous means 44 through the perforationszof'ears .24 and thencethrough -thenopenings ,in .the .overlapped ends of ltheflinks .of.chainsl2.

'Each table .26 has v:a especially devised clamp tforfholding the,bag'4-6 thereon -with `twocf .its marginal .edges projecting beyond theedges of the table. The dot-and-dash outline of bags 46,shown\in Fig.vl, vclearly reveals the manner fin which lthezclamp-now about vto bedescribed, .operably maintainsthe bag Lin place `upon table .formovement .through the two sewing .ma-

chines.

The bag clamp comprises bearings 48 and 50, integral with table 26 andjournalling shaft 52 upon which is mounted a drum 54 having a cam slot56. An arm 58 secured to shaft 52 carries beam 60 at its free end, whichbeam extends in parallelism with one edge of table 26. Another arm 52joined to shaft 52 connects with beam 60 at its free end to complete athree-sided upper frame portion below which a bag contacting frame ishung through the medium of short coil springs 64. The lower frame istwo-sided because it is necessary only to exert pressure upon bag d6along the marginal edges to be stitched. y

Bar 66 hung beneath beam 60 is free to move toward and from beam 60because of` springs 64, and further because a yoke 'I0 serves`as aguide;

` A similar yoke 12 depending from armv 62`strad,

dies bar Hl hung beneath arm 62. A leaf spring 'I6 anchored as at 1B toexert downward pressure on arm 62 of the upper frame cooperates withspring 80 to establish a compensating yet suincient pressure upon thebag when it is resting upon table 26 and beneath bars 68 andl.

Spring 60 has one end attached as at 82 to `table 26 while its oppositeend is fastened as at x vated condition, ready for'the operator to placea bag 46 and lower the clamp thereagainst.` When the clamp is lowered,spring 80 will assume that position shown in full lines of Fig. 3, andthereby yieldably hold the clamp and its underlying bag against the topof table 26.

There is a clampV of the aforementioned type secured to each of tables26 and when the drums 64 are carried past pin 86 mounted on frame I0,the engagement of this pin by cam slot 56 will move the clamp to thedotted line position shown in Fig. 3 to eject, by gravity, the bags thathave been stitched. Y

Pin 34 projects through slot 36 iny plate 22 for engagement with guidemember 88, mounted on frame I6 and disposed in the path of travel of theseveral pins 313, as illustratedv in Fig. 1. Whenrthe tables 26 and allthe parts associated therewith, are moved toward member 88 bychains I2,pinsSd of each table assembly will strike the edge of member 88 andcause table 26 to rotate about stub shaft 26 through a 90 arc and assumethe position shown to theleft in Fig. 1.

The movement of table 26 is against the tension of spring 38 and as soonas guide member 88 releases pin 34, spring 38 will draw table 26 to thenormal position or where its longitudinal axis is in alignment with thepath of travel as shown to the right in Fig. 1. A portion of table 26and its related parts is shown in Fig. 1, after member 88 has releasedits engagement and the pin 86 is within cam slot 56, as seen in Fig. 2.

The bags 46 are laid upon each table 26 as they pass the operatorsstation, which is at the right end of the machine, as viewed in Fig. 2.The clamp assembly is dropped upon the bags to hold the marginal edges90 and 92 beyond the proximal edges of table 26.

rIwo sewing machines of like character are disposed in tandem and in thepath of travel of bags 46. These sewing machines are generallydesignated by the numeral 94 and each is equipped with the conventionalpresser foot 916 and needle 98. The machines are mounted upon a portionof frame I6 and the tables |00 thereof are in substantially the samehorizontal plane as the upper face of tables 26, to the end thatmarginal edges SI) and 92 are drawn beneath presser foot 96 forstitching.

After the first machine 64 has stitched marginaledge 99 of bag 46,threads will trail behind bag 46 and join machine 96 to the bag untilthe threads are severed. Automatic means for cutting these threads isprovided for each machine 94 and the description of one will serve toclarify the construction and operation of all.

The chain I2 neXt to machines 94 carries a number of cams |62 arrangedto strike plunger |04 reciprocably mounted on frame I0 and heldin'normal position by spring |66. A cutter wheel |06 rotatably mountedon the end of arm III) is driven through the medium of belts I I2extending to the power mechanism of machine 94. Cutter wheel |68,therefore, constantly rotatesat a relatively high rate of speedwhetherNarm H0 is in the position shown in Fig. 3, or whether it is swung to athread severingv position when plunger Hill is engaged by one of cams|62., After'bagdl is moved past Ythe plane in which'cutter wheel `Ilill` is disposed, plunger |66 is kicked outwardly' in the direction ofthe arrowv in'FigB, toswing arm |I6 toward the trailing threads Lbetweenbag `I6 and needle 96.

Plunger |04 is joined to lbell crank lever.y |I4 coupled to another bellcrank lever YI I6 by vlink H8. Link |26 interconnects bell crank leverI6 with the upper end of arm I0 mounted to rotate Y about the axis ofpintle |22. Part of frame I0 supports arm II!) and the swingingmovementof arm I I6 serves to sever the threads before pin`34 on thetable carrying the bag being treated,

strikesguide member 88 to dispose marginal 'edge 92 in place to bestitched by theV next succeeding machine 94. There is a cuttingmechanism for each machine and cams |02 willinsure operation at theproper moment. f K' The preferred form of the automatic bag sewingmachine has |been clearlydisclosed and the function and manner ofoperation hasbeen made clear during the course of theforegoingspecilication. It is obvious thatY all the attendant" need dois to place the ba-g 46 on each table asit passes his station, lower theclamp to holdtheb'ag place'on each tableV 26, and' perform this'task laseach Ytable presents itself. Not/only4 will-the'two marginalA edges 6Uand 92 bev lstitclied',rlollth'the vthreads Will ybe severed at theproper timejand.

the completed bag will beejectedwhen the clamp is moved to a point wherethe bagwmaydrop by gravityY from each table 26. at thecnd'of ythemachine. y Obviously, bag sewing equipment havingv specic structuraldetails differing from thoseV shown and explained maybe .made jwithout`departing Lone, machine yand beforeitgreachesthesecond machine.

2. In bag making equipment of the character described, a pair of sewingmachines mounted in tandem; a conveyor for moving the bags along a pathof travel past the sewing machines; means for severing the threadapplied by each sewing machine after the bags have been stitched alongcertain marginal edges by the machines; and a bag supporting tablerotatably carried fby said conveyor for turning the bag held therebyafter one marginal edge thereof has been stitched by one machine andafter the thread therefrom has been severed and before the bag reachesthe second machine to a position for stitching another marginal edge ofthe bag by said second machine.

3. In bag making equipment of the character described, a pair of sewingmachines mounted in tandem; a conveyor for moving the bags along astraight path of travel past the sewing machines; clamps shiftablymounted on the conveyor to hold the bags in positions engageable by thesewing machines; and means for releasing the Ibags from the clamps afterboth sewing machines have acted thereon.

4. In bag making equipment of the character described, a pair of sewingmachines mounted in tandem; a conveyor for moving the bags one-ata-timealong a straight path of travel past the sewing machines where amarginal edge is to be stitched by each machine respectively; clampsshiftably mounted on the conveyor to hold the bags in positionsengageable by the sewing machines; means for releasing the bags from theclamps after the sewing machines have acted thereon; and means operableby the conveyor for severing the thread from the sewing machines afterthe bags have passed therethrough and before the bags are ejected fromthe equipment.

5. In bag making equipment of the character described, a plurality ofsewing machines; a conveyor for moving the bags along a straight path oftravel past the sewing machines one-at-a-time; clamps rotatably mountedon a vertical axis on the conveyor for holding a marginal edge of eachbag in operative relation to one of the sewing ma chines whereby theedges of the bags are individually stitched; and means for shifting theclamps to an inoperative position to eject the bags from the equipmentafter all the sewing machines have acted thereon.

6. Bag making 4equipment of the character set forth in claim 5, whereinthe clamps each have yieldable means for holding them in an inoperativeposition, said means serving as the clamping force when the clamps areholding bags therein.

7. In bag making equipment of the character described; a plurality ofsewing machines; a conveyo-r for moving the bags along a path of travelpast the sewing machines one-at-a-time; means for rotating the bagsafter they have been stitched by one sewing machine and before the nextsucceeding sewing machine stitches the bag; and means for severing thethread joining the bag and one machine before the bag is rotated toenter the next machine.

8. In bag making equipment of the character described, a plurality ofsewing machines; a conveyor for movingthe bags along a path of travelpast the sewing machines one-at-a-time; a clamp for securing the bags inplace on the conveyor; and means for rotating the clamp and the bag heldthereby through a turn after one marginal edge of the bag has beenstitched by one of the sewing machines and before the conveyor has movedthe bag into operative position with the next succeeding sewing machine.

FRANK LOMBARDO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date l145,329 Kerr Jan. 27, 1891858,005 Lowe June 25, 1907 1,187,057 Foster June 13, 1916 1,926,694Berger et al Sept. l2, 1933

